More information and a different question than my recent thread about this LCD:

[url]https://www.badcaps.net/forum/showthread.php?t=44342[/url]

I have sound, and now see the picture below (somewhat white, on the left), IF I disconnect the left t-con cable to the panel. With both connected, or only the the right disconnected, the entire screen is grey.

Same result with another t-con I have.

Can I be fairly certain it's the panel?

Thanks.https://More information and a diffe...his LCD:<br />...

Re: Sony LCD with sound, no pic, ? scope findings

I didn't state it clearly enough: Once I learned the t-cons weren't the same, I did get another that was the same as the original.

As mentioned, with the scope on a t-con LVDS pin, I do see activity when I push the menu button. Otherwise I see nothing, which leads me to believe the video signal is not getting to the t-con, so the t-con is unlikely to be the problem. Right?

Thanks.

Re: Sony LCD with sound, no pic, ? scope findings

Shopjimmy seems to say the AU board I have in the set 1-873-856-12 works, but the -11 (which I THOUGHT was the original) does not. Other sites seem to think they both work.

Re: Sony LCD with sound, no pic, ? scope findings

Sorry I didn't mention those things. I had checked the t-con fuse voltage--12v both sides. I had also pulled the ribbon connectors individually (I've done a LOT of research on testing LCDs ) and there is no change. I've also checked the voltage regulators and they all seem ok.

Hadn't thought about board revision #s. The replacement FB3 board # is the same, and I don't see any revision numbers. OTOH, interestingly, though they look identical, the AU board # is different. The original--I think--is 1-873-856-11....

Sony KDL40v-3000. Originally had no backlight, and 13 blink code. Found a bad CCFL and replaced that. Replaced inverter board and now had backlight.

I now have no blinking red light, just the green 'on' LED, audio, and no picture. Main board FB3, AU board, and t-con have all been replaced, though with used boards.

If I wiggle the t-con connector I see colored flashes on the screen.

I recently put an old TEK 465 on it and found that when I push the menu button, the signal on the t-con LVDS does change which I gather implies the main board is OK....

Sudden loss of picture and sound. Did some googling and found that a bad backlight bulb was common. Sure enough--one was out. Replaced it and backlight now works but still no picture or sound.

Power button works and green light is lit. No flashing red code. Voltages at cables on DF and GF boards are good. Fuses on all boards are good.

I did download the service manual, and have moderate experience with PCBs, but am not sure where to start looking for this problem.

Thanks!